Commit e3d7935a authored by Lifeng Zheng's avatar Lifeng Zheng Committed by Rafael J. Wysocki
Browse files

ACPI: CPPC: Add IS_OPTIONAL_CPC_REG macro to judge if a cpc_reg is optional 



In ACPI 6.5, s8.4.6.1 _CPC (Continuous Performance Control), whether
each of the per-cpu cpc_regs[] is mandatory or optional is defined.

Since the CPC_SUPPORTED() check is only for optional _CPC fields,
another macro to check if the field is optional is needed.

Reviewed-by: default avatarPierre Gondois <pierre.gondois@arm.com>
Signed-off-by: default avatarLifeng Zheng <zhenglifeng1@huawei.com>
Reviewed-by: default avatarMario Limonciello <mario.limonciello@amd.com>
Link: https://patch.msgid.link/20250411093855.982491-2-zhenglifeng1@huawei.com


Signed-off-by: default avatarRafael J. Wysocki <rafael.j.wysocki@intel.com>
parent 3a3ce10e

drivers/acpi/cppc_acpi.c

+14 −0
Original line number Diff line number Diff line
@@ -128,6 +128,20 @@ static DEFINE_PER_CPU(struct cpc_desc *, cpc_desc_ptr); 
#define CPC_SUPPORTED(cpc) ((cpc)->type == ACPI_TYPE_INTEGER ?		\

				!!(cpc)->cpc_entry.int_value :		\

				!IS_NULL_REG(&(cpc)->cpc_entry.reg))



/*

 * Each bit indicates the optionality of the register in per-cpu

 * cpc_regs[] with the corresponding index. 0 means mandatory and 1

 * means optional.

 */

#define REG_OPTIONAL (0x1FC7D0)



/*

 * Use the index of the register in per-cpu cpc_regs[] to check if

 * it's an optional one.

 */

#define IS_OPTIONAL_CPC_REG(reg_idx) (REG_OPTIONAL & (1U << (reg_idx)))



/*

 * Arbitrary Retries in case the remote processor is slow to respond

 * to PCC commands. Keeping it high enough to cover emulators where